institute. >>> thanks to president obama for the confidence, like an old soldier. >> so said david petraeus 15 months ago, september 2011, when he was sworn in as director of the central intelligence agency, petraeus was nominated by president obama replacing outgoing cia director leon panetta. now head of the department of defense. but petraeus suddenly resigned one week ago in petraeus' own words, a quote unquote extramarital affair. the woman in question, paula broadwell who is also married and co-wrote a 400-page biography of general petraeus last year when petraeus was still the top commander in afghanistan. >> it is a portrait of modern warfare. and i tried to show in the back how his ideas are playing out on the ground through the poor traits of three battalion commanders. >> petraeus still has a stellar reputation. a four-star general, with a 37- year military career. he was chosen by president george w. bush to oversee the surge strategy in iraq in 2007. he was sent by president obama to be the top commander in afghanistan, heading isaf, the international security assistance force.